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![Eric Pouech](/assets/img/avatar_default.png)
Signed-off-by: Eric Pouech <eric.pouech@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
250 lines
6.7 KiB
C
250 lines
6.7 KiB
C
/*
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* SHLWAPI thread and MT synchronisation functions
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*
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* Copyright 2002 Juergen Schmied
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* Copyright 2002 Jon Griffiths
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdarg.h>
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#include <string.h>
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#define COBJMACROS
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#include "windef.h"
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#include "winbase.h"
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#include "winnls.h"
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#include "winuser.h"
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#define NO_SHLWAPI_REG
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#define NO_SHLWAPI_PATH
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#define NO_SHLWAPI_GDI
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#define NO_SHLWAPI_STREAM
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#define NO_SHLWAPI_USER
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#include "shlwapi.h"
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#include "shlobj.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(shell);
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extern DWORD SHLWAPI_ThreadRef_index; /* Initialised in shlwapi_main.c */
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INT WINAPI SHStringFromGUIDA(REFGUID,LPSTR,INT);
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/**************************************************************************
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* CreateAllAccessSecurityAttributes [SHLWAPI.356]
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*
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* Initialise security attributes from a security descriptor.
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*
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* PARAMS
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* lpAttr [O] Security attributes
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* lpSec [I] Security descriptor
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*
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* RETURNS
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* Success: lpAttr, initialised using lpSec.
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* Failure: NULL, if any parameters are invalid.
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*
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* NOTES
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* This function always returns NULL if the underlying OS version
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* Wine is impersonating does not use security descriptors (i.e. anything
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* before Windows NT).
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*/
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LPSECURITY_ATTRIBUTES WINAPI CreateAllAccessSecurityAttributes(
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LPSECURITY_ATTRIBUTES lpAttr,
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PSECURITY_DESCRIPTOR lpSec,
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DWORD p3)
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{
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/* This function is used within SHLWAPI only to create security attributes
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* for shell semaphores. */
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TRACE("(%p,%p,%08lx)\n", lpAttr, lpSec, p3);
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if (!(GetVersion() & 0x80000000)) /* NT */
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{
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if (!lpSec || !lpAttr)
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return NULL;
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if (InitializeSecurityDescriptor(lpSec, 1))
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{
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if (SetSecurityDescriptorDacl(lpSec, TRUE, NULL, FALSE))
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{
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lpAttr->nLength = sizeof(SECURITY_ATTRIBUTES);
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lpAttr->lpSecurityDescriptor = lpSec;
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lpAttr->bInheritHandle = FALSE;
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return lpAttr;
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}
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}
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}
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return NULL;
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}
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/*************************************************************************
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* _SHGetInstanceExplorer [SHLWAPI.@]
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*
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* Get an interface to the shell explorer.
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*
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* PARAMS
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* lppUnknown [O] Destination for explorers IUnknown interface.
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*
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* RETURNS
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* Success: S_OK. lppUnknown contains the explorer interface.
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* Failure: An HRESULT error code.
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*/
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HRESULT WINAPI _SHGetInstanceExplorer(IUnknown **lppUnknown)
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{
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/* This function is used within SHLWAPI only to hold the IE reference
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* for threads created with the CTF_PROCESS_REF flag set. */
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return SHGetInstanceExplorer(lppUnknown);
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}
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/*************************************************************************
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* SHGlobalCounterGetValue [SHLWAPI.223]
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*
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* Get the current count of a semaphore.
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*
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* PARAMS
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* hSem [I] Semaphore handle
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*
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* RETURNS
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* The current count of the semaphore.
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*/
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LONG WINAPI SHGlobalCounterGetValue(HANDLE hSem)
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{
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LONG dwOldCount = 0;
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TRACE("(%p)\n", hSem);
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ReleaseSemaphore(hSem, 1, &dwOldCount); /* +1 */
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WaitForSingleObject(hSem, 0); /* -1 */
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return dwOldCount;
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}
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/*************************************************************************
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* SHGlobalCounterIncrement [SHLWAPI.224]
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*
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* Claim a semaphore.
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*
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* PARAMS
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* hSem [I] Semaphore handle
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*
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* RETURNS
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* The new count of the semaphore.
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*/
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LONG WINAPI SHGlobalCounterIncrement(HANDLE hSem)
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{
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LONG dwOldCount = 0;
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TRACE("(%p)\n", hSem);
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ReleaseSemaphore(hSem, 1, &dwOldCount);
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return dwOldCount + 1;
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}
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/*************************************************************************
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* SHGlobalCounterDecrement [SHLWAPI.424]
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*
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* Release a semaphore.
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*
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* PARAMS
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* hSem [I] Semaphore handle
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*
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* RETURNS
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* The new count of the semaphore.
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*/
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DWORD WINAPI SHGlobalCounterDecrement(HANDLE hSem)
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{
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DWORD dwOldCount = 0;
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TRACE("(%p)\n", hSem);
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dwOldCount = SHGlobalCounterGetValue(hSem);
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WaitForSingleObject(hSem, 0);
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return dwOldCount - 1;
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}
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/*************************************************************************
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* SHGlobalCounterCreateNamedW [SHLWAPI.423]
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*
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* Unicode version of SHGlobalCounterCreateNamedA.
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*/
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HANDLE WINAPI SHGlobalCounterCreateNamedW(LPCWSTR lpszName, DWORD iInitial)
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{
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static const WCHAR szPrefix[] = { 's', 'h', 'e', 'l', 'l', '.', '\0' };
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const int iPrefixLen = 6;
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WCHAR szBuff[MAX_PATH];
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SECURITY_DESCRIPTOR sd;
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SECURITY_ATTRIBUTES sAttr, *pSecAttr;
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HANDLE hRet;
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TRACE("(%s,%ld)\n", debugstr_w(lpszName), iInitial);
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/* Create Semaphore name */
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memcpy(szBuff, szPrefix, (iPrefixLen + 1) * sizeof(WCHAR));
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if (lpszName)
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StrCpyNW(szBuff + iPrefixLen, lpszName, ARRAY_SIZE(szBuff) - iPrefixLen);
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/* Initialise security attributes */
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pSecAttr = CreateAllAccessSecurityAttributes(&sAttr, &sd, 0);
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if (!(hRet = CreateSemaphoreW(pSecAttr , iInitial, MAXLONG, szBuff)))
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hRet = OpenSemaphoreW(SYNCHRONIZE|SEMAPHORE_MODIFY_STATE, 0, szBuff);
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return hRet;
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}
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/*************************************************************************
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* SHGlobalCounterCreateNamedA [SHLWAPI.422]
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*
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* Create a semaphore.
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*
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* PARAMS
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* lpszName [I] Name of semaphore
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* iInitial [I] Initial count for semaphore
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*
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* RETURNS
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* A new semaphore handle.
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*/
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HANDLE WINAPI SHGlobalCounterCreateNamedA(LPCSTR lpszName, DWORD iInitial)
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{
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WCHAR szBuff[MAX_PATH];
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TRACE("(%s,%ld)\n", debugstr_a(lpszName), iInitial);
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if (lpszName)
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MultiByteToWideChar(CP_ACP, 0, lpszName, -1, szBuff, MAX_PATH);
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return SHGlobalCounterCreateNamedW(lpszName ? szBuff : NULL, iInitial);
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}
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/*************************************************************************
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* SHGlobalCounterCreate [SHLWAPI.222]
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*
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* Create a semaphore using the name of a GUID.
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*
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* PARAMS
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* guid [I] GUID to use as semaphore name
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*
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* RETURNS
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* A handle to the semaphore.
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*
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* NOTES
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* The initial count of the semaphore is set to 0.
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*/
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HANDLE WINAPI SHGlobalCounterCreate (REFGUID guid)
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{
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char szName[40];
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TRACE("(%s)\n", debugstr_guid(guid));
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/* Create a named semaphore using the GUID string */
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SHStringFromGUIDA(guid, szName, sizeof(szName) - 1);
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return SHGlobalCounterCreateNamedA(szName, 0);
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}
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